Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, sang ma, nang cao
sach ty » sach tu, sach thu, xach tay
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
lai cua » dai cua, hai cua, lai chau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach y)) ((nang ma) or (nang x)) hoi. hieu van cac duc van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) ((nang ma) OR (nang x)) hoi. hieu van cac duc van hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) ((nang ma) or (nang x)) hoi. hieu van cac duc van hanh lai cua viet*.